1,720,982 research outputs found
Physical Model Study on Low-Crested Structures under Breaking Wave Conditions
No full textThe paper in-depth describes the experimental set-up and the results obtained by
some physical model tests performed in the wave flume of the IMAGE Dept. of
University of Padova considering a 1:100 sloping beach protected by 7 different
configurations of low-crested breakwaters. The behaviour of each structure, located
within the surf zone, was studied under the action of 4 different irregular wave attacks.
Aim of the study was to determine the performance of such structures, in terms of wave
reflection, transmission and overtopping, for waves breaking on the foreshore
(circumstance seldom considered in literature) and to suggest some new equations, of
practical engineering implication
Prove sperimentali sul comportamento di una scogliera a cresta bassa e sul fenomeno del piling-up a tergo di essa
No full textNel presente lavoro è descritta l’indagine sperimentale svolta nel canale ad onde dell’università di Padova per determinare il comportamento di una scogliera emersa a cresta bassa posta nella surf zone, con riferimento ai fenomeni di riflessione, trasmissione, tracimazione dell’onda ed incremento del livello idrico (piling-up) che si realizza a tergo dell’opera.
L’interazione onda-struttura è stata studiata riproducendo circa 60 attacchi ondosi irregolari. In una prima fase è stata analizzata una struttura permeabile, che ha permesso di stimare le portate di tracimazione (al netto delle portate di filtrazione dirette verso il largo), per diversi valori di piling-up, mentre nella seconda fase è stato posto un setto impermeabile sulla scarpata lato riva della stessa scogliera per quantificare separatamente le portate di overtopping oltre la sommità dell’opera e di trasmissione attraverso la porzione “emersa” della struttura e quindi per comprendere più nel dettaglio il complesso processo di filtrazione attraverso l’opera, legato anche al piling-up.
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In this paper the experimental results obtained through the physical model investigation performed in the flume of Padova University on a typical low crested structure is presented. Aim of the investigation was the evaluation of the behaviour of such a structure in terms of reflection and transmission of incident waves, as well as the study of the wave overtopping phenomenon and the associated increase in the water levels behind the breakwater (piling-up).
The wave-structure interaction was examined by reproducing about 60 irregular wave attacks. In the first part of the study a rubble mound permeable breakwater was analysed, while in the second part of the research an impermeable plate was placed on the landward slope of the structure, in order to study in more details the complex phenomena of the wave overtopping over the structure and of the seepage through it, also related to the piling-up level at the back of the structure
Physical model study of water piling-up behind low crested structures
No full textIn this paper the experimental results obtained through the physical model investigation
performed in the flume of Padova University on a typical low crested structure is
presented. Aim of the investigation was to evaluate the behaviour of this kind of structure
in terms of reflection and transmission of incident waves, as well as the study of the wave
overtopping phenomenon and the associated increase in the water levels behind the
breakwater (water piling-up). The wave-structure interaction was examined by
reproducing about 70 irregular wave attacks. In the first part of the study a rubble mound
permeable breakwater was analysed, while in the second part of the research an
impermeable plate was placed on the landward slope of the structure, in order to study in
more details the complex phenomena of the wave overtopping over the structure and of
the seepage through it, also related to the piling-up level at the back of the structure
Repression of Fgf Signaling by Sprouty1-2 Regulates Cortical Patterning in Two Distinct Regions and Times
No full textA fundamental question in developmental biology is how signaling pathways establish a transcription factor code that controls cell proliferation, regional fate and cell fate. Morphogenesis of the rostral telencephalon is controlled in part by Fgf signaling from the rostral patterning center. How Fgf signaling is regulated in the telencephalon is critical for understanding cerebral cortex formation. Here we show that mouse Sprouty1 and Sprouty2 (Spry1-2), which encode negative feedback regulators of Fgf signaling, are affecting cortical proliferation, differentiation, and the expression of genes regulating progenitor identity in the ventricular zone. In addition, Spry2 has a later function in regulating the MAPK pathway, proliferation, and gene expression in the cortex at mid-neurogenesis. Finally, we provide evidence that Coup-TFI, a transcription factor that promotes caudal fate, does so through repressing Fgf signaling, in part by promoting Spry expression
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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